Frames of heavy machine tools particularly forging presses and the like



April 5, 1966 H. H. GROOS FRAMES OF HEAVY MACHINE TOOLS PARTICULARLY FORGING PRESSES AND THE LIKE I5 Sheets-Sheet 1 Filed June 17, 1963 Ill/ 7/4 274 1 Aprll 5, 1966 H. H. GROOS 3,243,988

FRAMES OF HEAVY MACHINE TOOLS PARTICULARLY FORGING PRESSES AND THE LIKE Filed June 17, 1963 I5 Sheets-Sheet 2 I L J]:

April 5, 1966 H. H. 005 3,

FRAMES OF HEAVY MACHINE TOOLS PARTICULARLY FORGING PRESSES AND THE LIKE Filed June 17, 1963 3 Sheets-Sheet 5 United States Patent 3,243,988 FRAMES OF HEAVY lflACI-llINE TOOLS PARTIQU- LARLY FORGING PRESSES AND THE LIKE Horst Hans Groos, Metzkausen, Germany, assignor to Schloemann Aktiengesellschaft, Dusseldorf, Germany, a German company Filed June 17, 1963, Ser. No. 238,306 Claims priority, application Germany, June 28, 1962, Sell 31,677 2 Claims. (Cl. 72-455) This invention relates to a frame of laminar construction for heavy machine tools, particularly forging and like presses. It is already the practice to construct the frames of large forging presses which are too bulky and heavy to be moved by conventional means of transportation from laminar plates provided with holes for the insertion of tie rods for clamping the plates together. However, the holes in the plates Weaken the strength of the assemblies and they also have the drawback that the section modulus of the stack across the plates is less than that lengthwise of the plates.

The invention overcomes these objections by providing two retaining plates which embrace the faces of the stack of plates containing the plate edges, and which are held together by tie rods or the like extending outside the stack.

Preferably these retaining plates are so constructed that they also form the slideways for the press slide. Moreover the longitudinal edges of the retaining plates may be formed with thick flanges between which the sides of the stack are compressed by key members.

Each plate in the stack may have the overall shape of a chain link and the upper and bottom yokes of the press frame may be arranged to rest in the ends of the openings in the chain-link-shaped plates of the stack.

An embodiment of the invention will be more particularly described by reference to the accompanying drawings in which FIG. 1 is a schematic vertical axial section of a press according to the invention, the section being taken on the line I-I in FIG. 2,

FIG. 2 is a section taken on the line ill-11 in FIG. 1 and FIG. 3 is a fragmentary section on a larger scale, taken on the line IIIHI in FIG. 1, of one of the upright columns of the press (the section comprising a quarter extending to the two principal horizontal axes 26a and 26b).

The two halves of the frame each consist of a stack of plates 1 shaped like a chain link, and each including two upright columns, united by top and bottom transverse elements. The bottom yoke of the press rests in the lower end of the opening in the chain-link-shaped half frames. This bottom yoke consists of upright plates 2 and a bearer plate 3. The bearer plate 3 carries two cylinders 4 containing press plungers 5. The vertical centre axis of the press is indicated in FIGS. 1 and 3 by 25, whereas the two horizontal symmetry axes in FIG. 3 are marked 26:: and 2612 respectively. The two press plungers support a common squeezing plate 6 which in conjunction with the upright plates 7 and a casting 8 forms the slide. The yoke at the head of the press is formed by a stack of plates and a plate 10. The work is forged between parts 8 and 10.

As shown in FIG. 2, casting 8 has lateral extensions 11, each embracing one of the two columns 1a of the two halves of the frame. The columns 1a consist of several parallel plates 12 which have the overall shape indicated by 1 in FIG. 1. Bearing on each of the two column faces containing the plate edges is a retaining "ice plate 13 or 14, as shown in FIG. 3. These retaining plates are connected by tie rods or clamping screws 15 and thus hold the plate assembly 12 together. Laterally the margins of plates 12 are held between flanges 17 of the two retaining plates with interposed key members 18, such as wedges or other means capable of exerting a thrust between the flanges 1'7 and the plates 12. The retaining plates are also formed with faces 19 and 20 which form slideways for the sliding members 21 and 22 of the extensions 11 of the press slide. Each extension 11 is secured to the main casting 8 of the slide by bolts 23.

The longitudinal section modulus of the assembly of plates 12 seen in FIG. 3 is naturally high. It is further 3 increased by the tight compression of the plates by the key members 18. On the other hand, the crosswise section modulus of the plates 12 is small. Nevertheless, it is substantially improved by the presence of the retaining plates 13 and 14 which have their greatest section modulus in the direction across the plates 13 and 12. The retaining plates 14.- may be machined out of thick plates or they may be cast. However, their production from rolled material must be considered preferable, because the frames of large presses are subjected to high bending loads which they can better withstand if the material of the plates 12 and the material of the retaining plates 14 is the same.

it will be readily understood that, apart from forging presses, a frame of similar construction can be provided for other heavy machines, such as very large diecasting machines and the like.

What I claim is:

1. A frame for large forging presses and the like, comprising: columns each consisting of a stack of parallel plates, two retaining plates for each stack of parallel plates, the retaining plates extending across opposite edges of the stack plates, clamping screws holding the opposite retaining plates together, these clamping screws being located outside the stack of parallel plates, thick flanges on each retaining plate, engaging round the edges of the stack of arallel plates, and key members interposed between the said fianges and the stack of parallel plates.

2. A large forging or like press, comprising: a frame including columns each consisting of a stack of parallel plates, two retaining plates for each stack of parallel plates, the retaining plates extending across opposite edges of the stack plates, clamping screws holding the opposite retainin plates together, these clamping screws being located outside the stack of parallel plates, and slideways on the external surfaces of the retaining plates, and the press also comprising a press slide, lateral extensions of the press slide, and sliding members in the said lateral extensions adapted to slide relatively to the said slideways.

References Cited by the Examiner UNITED STATES PATENTS 459,816 9/1891 Miller -214 545,758 9/1895 Aiken 1002l4 3,024,676 3/1962 Howahr 78-42 FOREIGN PATENTS 15,222 7/1904 Great Britain. 788,891 1/1958 Great Britain.

CHARLES W. LANHAM, Primary Examiner.

WiLlAM I. STEPHENSON, Examiner.

G. P. CROSBY, Assistant Examiner. 

1. A FRAME FOR LARGE FORGING PRESSES AND THE LIKE, COMPRISING: COLUMNS EACH CONSISTING OF A STACK OF PARALLEL PLATES, TWO RETAINING PLATES FOR EACH STACK OF PARALLEL PLATES, THE RETAINING PLATES EXTENDING ACROSS OPPOSITE EDGES OF THE STACK PLATES, CLAMPING SCREWS HOLDING THE OPPOSITE RETAINING PLATES TOGETHER, THESE CLAMPING SCREWS BEING LOCATED OUTSIDE THE STACK OF PARALLEL PLATES, THICK FLANGES ON EACH RETAINING PLATE, ENGAGING ROUND THE EDGES 